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Enhanced anti-crossing in resonant reflection via structured waveguide gratings
Optics Express
|December 19, 2025
Summary
Structured waveguide gratings enable controlled optical coupling ratios. This allows for strong coupling, creating a new platform for studying coupled systems, verified experimentally in the mid-IR.
Area of Science:
- Optics and Photonics
- Materials Science
- Condensed Matter Physics
Background:
- Waveguide gratings are crucial optical components.
- Controlling optical coupling strength in different diffraction orders is challenging.
- Structured gratings offer a novel approach to manipulate light-matter interactions.
Purpose of the Study:
- To introduce the concept of structured period gratings.
- To demonstrate their capability for achieving strong optical coupling.
- To provide experimental validation of structured gratings for studying coupled systems.
Main Methods:
- Theoretical description of structured period gratings.
- Numerical simulations of resonant reflection spectra.
- Experimental verification using Gallium Nitride (GaN) on sapphire in the mid-infrared (mid-IR) spectral range.
Main Results:
- Structured gratings exhibit a controlled ratio of optical coupling strengths between diffraction orders.
- Weak first-order coupling leads to sharp mode excitation resonances.
- Strong second-order coupling results in large anti-crossing phenomena, significantly exceeding resonance spectral widths.
Conclusions:
- Structured waveguide gratings provide a versatile platform for studying strongly coupled systems.
- The demonstrated control over coupling ratios opens new avenues in optical device design.
- Experimental results confirm the theoretical predictions for mid-IR applications.
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